package Leetcode.tools;

  public class TreeNode {
     public int val;
     public TreeNode left;
     public TreeNode right;
     public TreeNode() {}
     public TreeNode(int val) { this.val = val; }
     TreeNode(int val, TreeNode left, TreeNode right) {this.val = val;this.left = left;this.right = right;
     }
  }
